From: Divyesh Shah <dpshah@google.com>
Date: Thu, 7 Jan 2010 02:58:20 +0000 (-0800)
Subject: cfq-iosched: Respect ioprio_class when preempting
X-Git-Tag: v2.6.33-rc5~8^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=875feb63b9567442be73efbcc9a8470e376d6423;p=pandora-kernel.git

cfq-iosched: Respect ioprio_class when preempting

In cfq_should_preempt(), we currently allow some cases where a non-RT request
can preempt an ongoing RT cfqq timeslice. This should not happen.
Examples include:

o A sync_noidle wl type non-RT request pre-empting a sync_noidle wl type cfqq
  on which we are idling.
o Once we have per-cgroup async queues, a non-RT sync request pre-empting a RT
  async cfqq.

Signed-off-by: Divyesh Shah<dpshah@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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